# EV Master vs Transformer Calculation Tool

The clearest difference is in-app purchases: EV Master at none against Transformer Calculation Tool's 1. Transformer Calculation Tool's advantage is iOS requirement (13.0 vs 15.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Transformer Calculation Tool sells 1 one-off in-app purchase. EV Master asks for nothing beyond the download.

EV Master ships an update every 5 weeks, Transformer Calculation Tool every 4 weeks. The most recent releases landed on October 1, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | EV Master | Transformer Calculation Tool |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 4 weeks** |
| Size | 66 MB | 57 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [TopTekk Technology Co.,Ltd.](https://appshunter.io/developer/1756241206) | [Shraddhaben Parmar](https://appshunter.io/developer/1889769325) |

## What reviewers say

### EV Master

[App page](https://appshunter.io/ios/app/ev-master/id6758076529)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Transformer Calculation Tool

[App page](https://appshunter.io/ios/app/transformer-calculation-tool/id6772152007)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime premium | $9.99 | one-time |


## Frequently asked questions

### Is EV Master free?

EV Master is free to download, with no in-app purchases.

### Is Transformer Calculation Tool free?

Transformer Calculation Tool is free to download, with in-app purchases available.

### Do EV Master or Transformer Calculation Tool have ads?

Neither EV Master nor Transformer Calculation Tool shows ads.

### Which is updated more often, EV Master or Transformer Calculation Tool?

EV Master ships an update every 5 weeks, and Transformer Calculation Tool every 4 weeks. Most recently, EV Master was updated on October 1, 2026 and Transformer Calculation Tool on September 16, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*